Section04ENGINEMANAGEMENT(15034-TEC)
Subsection 03 (COMPONENT INSPECTION, REPLACEMENT AND ADJUSTMENT)
To see the connector pin-out, temporarily remove
the connector shield joining the harness, to ex-
pose the terminal numbers. Connect a voltmeter
to the terminals of the wiring harness as per the
following table.
Remove and reinstall the safety lanyard to activate
the ECM.
Check the voltage readings as follows.
CONNECTION VOLTAGE
Terminal 1 with engine
ground
0V
Terminal 2 with engine
ground
5V
Terminal 3 with engine
ground
4.5 - 5 V
If voltage test is good, replace the TPS.
If voltage test is not good, check the resistance of
the TPS circuit.
Resistance Test
Reconnect the TPS.
Disconnect the ECM connector A on the ECM.
Using a multimeter, check resistance values as per
the following table.
ECM CONNECTOR
THROTTLE
IDLE
POSITION
WIDE OPEN
THROTTLE
POSITION
PIN PIN RESISTANCE
A-24 A-25 1000 - 1100 2600 - 2700
A-25 A-39 1600 - 2400 1600 - 2400
A-24 A-39 2500 1000 - 1100
NOTE: The resistance value should change
smoothly and proportionally to throttle move-
ment. Otherwise, replace TPS.
If resistance values are correct, try a new ECM.
Refer to ECM AND MPEM in this section.
If resistance values are incorrect, replace TPS.
Replacement
Remove the throttle body as described above.
Loosen two screws retaining the TPS.
Remove TPS.
2
1
R1503motr168A
THROTTLE BODY
1. Throttle position sensor (TPS)
2. Screws
Apply Loctite 243 on screw threads, install the
new TPS.
Reinstall remaining removed parts.
Proceed with the CLOSED THROTTLE AND IDLE
ACTUATOR RESET. See below.
Closed Throttle and Idle Actuator Reset
NOTE: This operation performs a reset of the val-
ues in the ECM.
This reset is very important. The setting of the
TPS will determine the basic parameters for all
fuel mapping and several ECM calculations and
the setting of the idle bypass valve will determine
the basic parameters for the idle speed control of
the engine.
NOTE: Resetmustbedoneeachtimethethrottle
position sensor (TPS) or the idle bypass valve is
loosened or removed or throttle body is replaced
or ECM is replaced.
CAUTION: An improperly set TPS or idle
bypass valve may lead to poor engine per-
formance and emission compliance could
possibly be affected. In addition, improper
idle bypass valve reset may lead to poor en-
gine starting, improper idle (too low or too
high) and engine stop on deceleration.
Use the vehicle communication kit (VCK) with the
B.U.D.S. software to perform this adjustment.
smr2005-013 121
To Next Page
Loading...
Need help?
General
